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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118450
Our Price: $34.38
Custom Fit Vehicle Wiring

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118450 - 4 Flat Tekonsha Custom Fit Vehicle Wiring
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118450 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (399)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118450

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind tail lights
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

118450 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118450 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118450

Average Customer Rating:  4.8 out of 5 stars   (399 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required.


All fine. Nice rig. Installers complime nted.


Watch the [online] videos on how to install & follow the instructions. The hitch & wiring harness install exactly as described. Couldn't have asked for an easier install.

2010 Chevrolet Traverse

eTrailer totally rocks! !! First of all, I only discovered your website as a result of trying to price a wiring harness for my vehicle. I had gone to the local store to get an estimate for installing a wiring harness on my 2010 Chevy Traverse, and was appalled that they wanted to charge me $79.99 for the wiring harness and then $100 labor!!! I couldn’t believe it – and went home and googled wiring harnesses, and I found your website among the search results. Right there on the page for my wiring harness was a 4-minute video with beautifully detailed instructions for how to install the harness on my vehicle.

Without hesitation, I ordered the part from your website, and days later I had it delivered to my door. I recently had knee surgery, so I enlisted the help of my 12-year-old daughter, who, after watching your instructional video, was ready to go... In no time at all, she had the wiring harness completely installed. Not only did she gain a sense of accomplishment, she also gained $10 to add to her piggy bank.

THANK YOU eTRAILER! I will be recommending you to everyone!


I can't say anything bad about the wiring harness for my trailer hitch. Along with the YouTube video that showed me how to do the install, this was about as easy as I can think it would be.

The connectors work perfectly - no issues with the brake or turn signal lights. The rubber cover for the connectors means that it is not dirty when I need to use it.


I purchased both a receiver hitch , Item # 75528 and the wiring harness. The hitch install would be like medium difficulty in my opinion! It required to drop the dual exhaust pipes so that you can move your tools in and around the hitch. Honestly it took several hours to loosen the rust that had build up throughout the years using wd40 and other things, so that the bolts that the hitch required for the install would fit! If it had been a new car with no rust, install would have been a breeze. The wiring harness, unfortunately, I misread the link the hitch recommended me to purchase! I called etrailer, girl said, It was a harness for a pre-existing manufacturers harness and so I had to replace it at my own expense! They recognized the issue and ordered the correct part. I received the new harness! It requires you to remove both rear break lamp housings! Got harness ran, when I realized the harness was short! I kept adjusting and checking to see if it was caught on something, but everything was fine. I got a revelation! The harness has cable ties wrapped around several areas of the harness! It comes like that from the manufacturer. I decided to cut one cable tie off and it stretch enough to reach the 2nd lamp housing. I used extra long cable ties, not supplied by supplier!, and tied any access harness to the tow hitch so that it isn’t hanging everywhere. But all in all it looks nice. Time consuming but nice.


My husband plans to take our grandchildren fishing.We know have something to use to hitch our car, its a great way to spent time fishing with the whole family .

2009 Chevrolet Traverse

i bought the package, hitch,harness and ball mount. the harness took
a couple hours, i had trouble getting the taillight assembly out of
my traverse, no fault of the product. installation was easy and perfect.
i recommend this product to all.

Buick Enclave

They work great easy to install, great product. Wired them in a Buick enclave.

2011 Chevrolet Traverse

Great products and service.


Easy to install. No splicing or jacking. Great for small trailer towing.

2011 Chevrolet Traverse

Extremely simple to install works great!!! This harness is worth the money!


Easy to install, was the correct fit. I have had this on the car for over a year and no problems to mention.

2010 Buick Enclave

Easy installation, and all lighting on my pop-up camper is working properly. I highly recommend this product!

2010 Chevrolet Traverse

etrailer staff went out of their way to get the shipment shipped out late tuesday. arrived Friday evening. The installation video made the installation a snap. Installed in about 30 minutes by removing the taillight lenses and cafefully routing wires away from exaust and tie-wrapped to hitch. First quality wiring kit for 2010 Chevy traverse. Saved time and money. I am very pleased and will make eTrailer my first call for my trailer needs. I couldn't be happier.

The wiring harness for the trailer lights is working without any problems.Easy installation and fast shipping. it is well designed and has performed well in all weather.
Marty - 01/21/2015

2009 Chevrolet Traverse

Installed as directed. Your YouTube video on my year Traverse, 09, was very helpful. I would quickly suggest your product to anyone who needs the towing package.

2010 Chevrolet Malibu

Great product. Easy install. Would but again. Great company!!!


Awesome product! Fit well, easy to install. Order the correct plug and play adapter makes easy installation. Lots of flexibility and options to customize for each trailer.


Very easy to install

2011 Chevrolet Traverse

I ordered the wiring harness with 5 to 7 day shipping and Jacob D. was able to get it to me earlier at the same shipping cost! The product arrived in great shape, was easily installed and I am completely satisfied!! I will definitely use again and recommend them to my family and friends. Thank you!!
Dave C.

Product is still working great!
Dave C - 05/26/2015

2011 Chevrolet Traverse

Fast shipping thanks

2011 Chevrolet Traverse

Very easy to install, great product

2009 Chevrolet Traverse

This is a quality well built product. i know this for two reasons. i have installed about eight differnt brands over the years. the second reason is a bit unusual. i intalled this one twice. months after installing the hitch and harness my wife got into an front and rear collision. Everyone was fine but insurance totalled the vehicle. i removed the hitch and harness and reinstalled it on a newer model Traverse. This time i had a buddy hold one side while i started the bolts. Otherwise both are easy great products.

2017 Buick Enclave

Ordered a hitch for my 2012 Buick Enclave in August of 2017. The fit was perfect. I also ordered the wiring harness adapter. The wiring and hitch installation took less than 2 hours. I’ve been using it for a year now and everything is still working perfect. This is the third car that I’ve used an etrailer hitch on and I couldn’t be more satisfied.


When I first installed the wiring harness the passenger side rear turn signal would not operate. This caused a number of other malfunctions, e.g. the ignition key could not be removed, the power windows would not operate, the power sunroof was inop., etc. It confused me as I did not know what had occurred to cause all these things to go wrong. After some online research I found that somehow the fuse had blown and caused all of the related malfunctions. Upon replacing the fuse all was well. I subsequently hooked onto a rental trailer, towed it near 1,700 miles and hitch and wiring system worked perfectly. In summary, even after an initial scare and anxiety over the blown fuse, I would definitely recommend your products.


everything was perfect could not be more satisfied

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Installation Instructions for Wiring a 2008 Buick Enclave with a T-One Vehicle Wiring Harness 118450
    I have included a link below to the instructions for wiring part # 118450 to your 2008 Buick Enclave.
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2012 Chevy Malibu
    For your 2012 Chevy Malibu we have the T-One kit part # 118450 that you referenced which is a confirmed fit and will work well. It does store inside the cargo area of the vehicle when not in use. Having the 4-way run out of the back hatch is actually the preferred method although it seems like it wouldn't be. Having the 4-way stored inside the cab of the keeps it protected from rain and moisture to prevent corrosion and keeps it protected from damage to the wiring or connector by rocks...
    view full answer...
  • Where Does a Trailer Wiring Harness Ground on a 2012 Chevy Traverse
    The white ground wire is bundled with the yellow and brown side of trailer wiring harness # 118450 and that is the side that plugs into the left (driver's side) tail lights. The instructions are a little confusing because it doesn't actually say that you ground the white wire on the right. The step for grounding the white wire comes after routing the green wire connectors to the right side though so it makes it seem like the white wire should be on the right side. But the instructions...
    view full answer...
  • Trailer Wiring Harness for a 2009 to 2012 Chevy Traverse
    The Tow Ready trailer wiring harness # 118450 is designed to fit all models of the 2009 to 2012 Chevy Traverse. I have included a link to a video showing installation on a 2012 Traverse for you.
    view full answer...
  • Left Turn Signal Blows After Trailer Wiring Harness Install on a 2011 Buick Enclave
    There is always a possibility that the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118450 is faulty but I would say that 90% of the time this is not the case. For starters, you will need to inspect the pins inside of each connector that goes to the taillight to ensure they are not bent or broken. If they are then this is what is likely causing the short. If the pins are not bent/broken then I would begin to trace the left turn signal wire from the harness to the...
    view full answer...
  • Recommended Trailer Wiring Harness for a 2011 Buick Enclave
    Yes, we do have other trailer wiring harnesses for your 2011 Buick Enclave. For this, I recommend the T-One Vehicle Wiring Harness part # 118450 which is a completely plug and play option that will not require you to cut or splice any wires. Tekonsha brand wiring products we have found to be the most reliable which is why I recommend this harness over the other options we have for you. In regards to the old harness you had, this was more than likely caused by a short which overloaded the...
    view full answer...
  • How Does Tow Ready Custom Fit Vehicle Wiring, # 118450 Install on a 2010 Chevy Malibu
    There are two possible trailer wiring options for the 2010 Chevy Malibu depending on which model you have. All models except the LTZ, use the Tow Ready Custom Fit Vehicle Wiring, # 118450. This is a T-One harness that plugs in line with the vehicle taillights. The connectors with the yellow wire go to the left taillight and the connectors with the green wire connect to the right taillight. The white ground wire gets attached to the bare metal surface behind the left taillight. I have included...
    view full answer...
  • Trailer Wiring Harness for a 2011 Buick Enclave
    Trailer wiring harness # 118270 is not a confirmed fit for the 2011 Buick Enclave but we do have wiring harnesses that will fit. For your 2011 Enclave you can use # 118450 which plugs in line with the vehicle tail light wiring. I have included a link to a video showing an example installation for you.
    view full answer...
  • Wiring Harness That Fits a 2017 Chevy Traverse
    The T-One Wiring Harness # 118450 will not fit your 2017 Chevy Traverse; as you mentioned it fits a 2012 Traverse without the factory tow package. Since you have rear AC, what you would need for your '17 Traverse without a factory tow package is the T-One Vehicle Wiring Harness - 4-Pole Flat Trailer Connector # 118270. I've included links to a review video and install video for you to take a look at.
    view full answer...
  • Trailer Hitch and Wiring Installation Difficulty and Details for a 2010 Chevy Traverse
    We have a difficulty rating system based on how long it would take the average person to install a hitch. For the Draw-Tite Trailer Hitch, # 75528, and your 2010 Chevy Traverse, we rate the difficulty at a 3 out of 10 meaning it should take about 30 minutes. There is no drilling required. You will have to temporarily detach the rubber exhaust hangars to put the hitch in position. I can tell you that with the proper tools, and someone to help you lift and position the hitch, this is a...
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2013 Chevy Traverse LTZ AWD
    For your 2013 Chevy Traverse, you'd want to use the part # 118270 trailer wiring harness. In addition to the wiring harness, the fuses and relays needed to activate the trailer illumination wiring portion of the tow package are included. If you click the provided link, you an see the installation instructions as well as an install video. The # 118450 you referred to fits Traverse models up through the 2012 model year, and wouldn't work on your 2013 Traverse.
    view full answer...
  • How Do I Tell If My 2012 Chevrolet Traverse Has a Tow Package
    In order to determine if your 2012 Chevrolet Traverse has the factory tow package you will want to look for a sticker in your glove box. If there is a three digital "V92" code shown then you have the factory tow package. If you do then you will want to use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118384 which plugs into a single port under the rear bumper. If you do not then you will want to use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer...
    view full answer...
    Image 1 for
  • What Is the Correct Trailer Wiring Harness for a 2011 Buick Enclave Without Tow Package
    There is more than one correct trailer wiring harness for your 2011 Buick Enclave. That said, they each differ in quality. If you are looking for the best quality option then I recommend the T-One Vehicle Wiring Harness part # 118450 which is plug and play as you can see in the attached install video. If you will be towing a trailer then you are also going to need a ball mount/hitch ball and for that we have the Ball Mount Kit for 2" Hitches part # 989900 which comes with everything you...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2010 Chevy Traverse
    I have a trailer wiring harness that does fit your 2010 Chevy Traverse, but the # 56094 is not it. Instead you would want the part # 118450 which is a confirmed fit and will work well. I attached an install video for you to check out as well.
    view full answer...
  • Will Tow Ready T-One Vehicle Wiring Harness # 118450 Fit My 2010 Chevrolet Traverse w/ Tow Package
    The item you selected, T-One Vehicle Wiring Harness with 4 Pole, part # 118450, will work on all models of the Chevrolet Traverse. The # 118450 harness plugs in-line with your tail light wiring connectors and is not connected to the fuse block. To install, you would just plug in-line with your tail light wiring harness and connect the ground wire to a clean metal surface on the vehicle frame. This harness will give you a 4-way connector at the rear of your vehicle. If you are needing a...
    view full answer...
  • Can Hopkins Custom Tail Light Wiring be Used along with a T-One Harness on a 2010 Chevy Malibu
    The Hopkins # HM56106 and the # 118450 can indeed be used together without conflict, but the only problem you might have is the limited amount of space available between the back of the tail light and the vehicle body. Some of your connections might need to be pushed through the grommet into the trunk interior in order to get the tail light assembly put back into place. The Hopkins flat towing wiring harness should be plugged into the rear of the taillight assembly, the # 118450 connected...
    view full answer...
  • How to Wire a Trailer Connector Harness on a 2009 Chevrolet Malibu
    If your 2009 Chevy Malibu is not an LTZ model, you do not have to hard wire the connector. You can use a T-Connector style harness, part # 118450, and connect to the connectors at the back of the tail lights. If you do have an LTZ model you will have to hardwire your Malibu using something like part # 119147KIT. We have a video of the installation of a similar part on a 2004 Malibu that will walk you through the process. Due to the body change in 2008 and up models, the wiring may be in...
    view full answer...
  • Will Trailer Wiring Harness from a 2012 Chevy Traverse Fit a 2015 Chevy Traverse
    The trailer wiring harness you have now for the 2012 Chevy Traverse is # 118450. It only fits up to 2012 models. The 2013 model year had some changes that continued in the 2014 and 2015 models which is why the wiring harness for the 2012 models will not fit the 2015 models. For a 2015 Chevy Traverse that did not come with a factory trailer connector you can use Curt harness # C56181.
    view full answer...
  • 4-Way Trailer Connector Recommendation for a 2011 Chevy Traverse
    If you have a round trailer connector harness under the bumper of your 2011 Chevy Traverse the part # C55515 would work as a 4-way harness. If you can't find that connector you would use the part # 118450 for a 4-way harness. If you need to order something right now this harness would fit regardless of your setup.
    view full answer...
  • Troubleshooting Left Side Trailer Running Lights that are Not Working
    The first thing you'll want to do is determine if the problem is with the new wiring harness on your 2008 Buick Enclave or on your trailer. Both sides of the tail and marker lights run on the brown wire. Since you have only one side working the problem is most likely with the trailer. Use a circuit tester, like PTW2993, and test each contact on the new 4-pole connector. If they all pass, then check the wiring on your trailer. I would start by inspecting the trailer's connector, making...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2015 Chevrolet Traverse
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2015 Chevy Traverse you need to install a harness that draws power from the battery to protect the taillight circuits. For that you would...
    view full answer...
  • Trailer Hitch Recommendation for 2011 Chevy Traverse
    The trailer hitch I recommend for your 2011 Chevy Traverse is the Draw Tite hitch part # 75528 because it has the best capacity, is a 2 inch size which is most popular size for hitch accessories, and it installs very easily. I attached a video that shows it installed on a similar 2011 Traverse for you to check out as well. For trailer wiring to allow your vehicle to control the taillights of the trailer you'd want the T-One kit part # 118450 because it installs without requiring any hardwiring....
    view full answer...
  • Trailer Hitch and Wiring for 2011 Chevy Traverse LT
    The answer is going to depend entirely on the fully loaded weight of the food trailer and if your 2011 Chevy Traverse LT has the trailer towing package. I looked up a copy of the owner's manual and it states that a 2WD can pull a trailer that is a maximum of 2,000 lbs UNLESS it has the V92 Trailer Towing Package. If it does the maximum trailer weight is 5,200 lbs; if you are unsure if your '11 Traverse has the towing package you can call your local Chevy dealer with the VIN and they will...
    view full answer...
  • Heavy-Duty Trailer Hitch Recommendation for 2009 Chevy Traverse
    There is one option for a trailer hitch that stands out for your 2009 Chevy Traverse, since you mentioned wanting a heavy-duty hitch, and that is the Draw-Tite Max-Frame Trailer Hitch Receiver # 75528. This hitch has the most robust capacity of 750 lbs tongue weight along with 5,000 lb towing, which is a testament to its strength. It will also be a smooth installation on your '09 Traverse without any type of drilling into your frame required. I have added a link below to a video installation...
    view full answer...

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